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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a1951dc782bbf454bb5f9f57d156c31532b5f0ec7cb583723892c70bb3e4b2' 
  AND token = '8ia/S+btVvIo2a2/6k7ggnJpUNEZJlx2FarwXEzXBO4=' 
  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"
    }
  }
}