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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4bbe204971d8532ed9af9cf8043fb832b4467d4cc802c9f8147986a6ab0a0c' 
  AND token = 'cxtJP+IJvFVCaGUJFw8u0767xTFwAnJFyk/O0GI2no0=' 
  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"
    }
  }
}