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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec7306edd63b60118d43aedb3fef57496e1b9a8c323c5ff13b16b6cb72006d9' 
  AND token = 'cqZPiEXf5VfhiOwsIxn3S4SUpH3b12wB/f/ZnNm4I9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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