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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d534997c5219ad63d4f6964746a7267b0974d91780d517e637a76c829b0ccae' 
  AND token = '8lNZ9r1U4kEeKCRuz4q6yK1K8Rgexxz5W/DMDHEmROw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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