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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b42cd014d886be987d2c9a98cac9f930d03c92f5c672f44f0222122b3b8a418' 
  AND token = 'r3t/EF3igNqZahgu0ue87Dn6ZNNIfxNt7mtg9z3Je14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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