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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7768b5e5f29deb8ea4eccf677253523dacf2a8e7f0d422910491ce1283f881dc' 
  AND token = 'T3Bec/eF1eKfhx1a91oKNmkPLaHiQHFKm1X8Ck481po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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