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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4ca0ebb46910fdb37247de13b317d66ad7ffb883b93a73061445bfd26a0e47' 
  AND token = 'bSyrIKZRoi/w5pv31s8dTo5LHeF0oxbCvAIBXUxAzmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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