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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c8c94531ca3b2421537446f0edee0d8f7744a10739c9e9fa1d23345980ac30' 
  AND token = 'XuYJSZ+yYAHxWHcu4u8bCivzxwwSGrQtuuyen2fqWJA=' 
  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"
    }
  }
}