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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf80373a78a577946826b19ce40cfded3af4b7f9549b4c6a3766d7b7e64321a' 
  AND token = 'omc1WUYapHr8Tfk1oAJpZTWBiNG4CP32JdxwQXb/H+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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