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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8596efe1d7702e10b27a3976ff059ed1fb0ec5195a771afdd5403dbae8a1e89' 
  AND token = 'OP9xauj0hPlkrwOodePyCwtyRLS++OOw+v2NIPH6JeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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