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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf5436cf110f6c4edab1efb319a809b27258852988c0eb154cb62a82273758a' 
  AND token = 'fAX8NenevamMu0fLrM7W+DuNf7nB2mkXvJChjQMMOmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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