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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c80e2bbee1a294cfd23b096e72c525d83d24ce82b5e2393d8532f48e9b93a6a' 
  AND token = '7Sn9V3kTyfgqZ7wNKryGFcAYKR26KJzRMe2JabWRDYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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