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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8936de3e100669898ba3872577cf11cac11806e5e4529313f68f65b536d26eb5' 
  AND token = 'DeYheksXYxlq4M8GsQhl3j1gGjYkeIx7hn+ykV8FKeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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