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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58bf4fab2a7e3a33f51d4820c769db83a49ede6004385c41bf94ffdaffbdcf6' 
  AND token = '5UUwqLwSNFyeNoweU8sJ8oPh4UDL0fiITPR4vTTbykw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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