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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a000ab5d1435ab89669f1b2cebfe8984f1e36d4326cb1f5a9ec01ced57c9e3f1' 
  AND token = '9YnFzyNVRxzzfYM4vlFYuFH/yGRj+VfoZ2+3DeSK5HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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