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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9bb377a74c2939cc23e969148e6e30acfff67daed6d0b70b3fe981f972e61c' 
  AND token = 'NjLBH9rsIzEQ5QHhTpbOnsnDKQAt7e0Wc2/bJhcfmkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}