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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14daa0508d60d5a6abcb64d4145d35d075d4b07789ac3de0ed2b4acac615d86f' 
  AND token = 'zMRbe6hU7JyGAHxj9SIuQOi2yCtlqzVcUnL1rtevyU8=' 
  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"
    }
  }
}