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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1194c9220244d027af19f2178822fb583183e9e3d7e43f3bdb1daa613c16d9e0' 
  AND token = 'Bl+X+s4+rX4XyE7gQPwEepmOH067YDfRGfNvMs9r/jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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