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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5f2d8d457d8e0f49d3984b755cf5590b6ecf6c103e4364ade40977daa65547' 
  AND token = '27gGEPRfOEchVf+rmKAZNuA8xpNOEGxX5jSwm2+zDhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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