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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaaaa45e2dcc4e6de7bbcd24b07c03353bc8135ebd2a20b91280c72c794f5aa' 
  AND token = 'isyEEOX3mWYw8OBDO7shApiDucF9ddcBUXST90QDYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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