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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5355f1d97adb8b919c3ea3d5052f216c27c2e0903dc1437cea36b6cfe3bf270a' 
  AND token = 'v8hit9sdxqkzHGMJhLKOcrBOzxE4YQ2CF12oOcLNvnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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