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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb134abbd22942b9b0df9e786a2675a7f924d26720784b4aa060664603b86d50' 
  AND token = 'Y3HhW9xRmDlfuAZpYtEEi/V55hzkvhMIssQq5ozTkgY=' 
  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"
    }
  }
}