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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ecc181931024f62f5a30f5c1aae08bbf556213bf4f95b3a1b3dfb5f019b5435' 
  AND token = 'D8fSzu1Nkis+qCbQ/nDFfzIX5ZUHsfbG6AWMNqx0BiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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