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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9b4e9e9b48f7c8ded0c0e98f3708ca017f41bda28bbf7ba21771691092d8b8' 
  AND token = 'QI5n4zYxf1afomUhPUqNVbd42C5Pg9QPNxdA5clTaes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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