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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b46de3418755b72c0374f018ee2e2eb42f70baf7f7daeb48d7bbc8525c959a7' 
  AND token = 'XIpYGeEI8p4L91CPBpFPEQvmgjmuhC95yl7g711wX9s=' 
  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"
    }
  }
}