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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2e5daf08bac9d9bb761c710978dc47b6e639ae16afa40f97f5f4dd92ea829f' 
  AND token = 'Ql3/cNZYUILdCdiYaIF2+Un1eGHpeZRtP7yff/AdnJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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