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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3ec9aa04c83f1b1e5f4d6f5011c7e0b372a924784c30d432655a7e3d907160' 
  AND token = 'j51nKxZpoM+FxuVNxn1ck7ZrHMbDRc4Ktf9msxSwvvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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