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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b7ca1a75b88a694f3208782964c071b07e3c900fa5ecf2e6187a02ad14fe71' 
  AND token = 'MlLbv8Cce5I1QqF2ML2QfAR2jyfN0dkvIbedrpSE8Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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