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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2de05030c616394451b168eb2997d9286eab2ee874ec7523a5a5af3bf216ed' 
  AND token = 'z2gZr94YxG1dNSbPQKrd+bPzngBEiRLJtC5mLx24N+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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