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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333a4c7eb23fa67b93452d5b18c3b26f9924440b27da7e88858f4595d0626258' 
  AND token = '0y9Wk/fLri94Mat271j53PUGpjqBDIYU9N45kdrYpbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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