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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fad2be67c1c1c156d6d46e83dbcbcfa8f4a1ba1ed49cfc7c99842ea792e3d9e' 
  AND token = 'QHI2JrXS2MBHJ4h5+0SNVODLfasIkhYMX6mg0BGLGAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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