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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6a7b82ec0169413dc55ac382883365ad055cc55289da0e1d1f3dbde1d79828' 
  AND token = 'y10JABL7R6aifpq6Q3TPUUF6ExVbtglPOj/tZspSiSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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