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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c66a090db847afe035d28f240ac25da8d721d87d0f64a2f2b5c4224a25505a' 
  AND token = 'pphGJCOczQMME3ouaQeh4H7z8YS5UsiYJuzBo5o7iXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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