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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c00bc6e9c2f7ea49a9d051572aff090e27f18deaafd229303c2e0c90531888' 
  AND token = 'Qb8N3WSvUsOk6zdTPJEllOiGj8iX9Aer9J9zPbEWgnw=' 
  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"
    }
  }
}