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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb97233a2c4252b2d0b663b60c1a5cade8bb77dfe26561d2143cdeb92edd821' 
  AND token = '28oUVc9Ly5uGf/Z1+obiPRkgYLsAMC6UXndwRX/jhjc=' 
  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"
    }
  }
}