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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f6737453834c36ef704462efaa3d1aecf370e823682969e1ce865b9ca0d63e' 
  AND token = '2sQtucMnxbAp+q5WtW0q+XEskZ1mrIrTwIOU8sICXxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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