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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a680700bac322e3f09a2851c773cce5ccc7c871ea83aa665db62e93a6e127c' 
  AND token = 'qpwoYmAF+FUvWcaZsk1oK9/Jk2I2gJDLc+BMe37bo2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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