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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae002fb496e0a5d710505ab1fa977f1ecb1ae1ee71a7d2b7d6ec56a15c172524' 
  AND token = 'T8aQv7lFY/1GrxMNCqXng+s9SkF5AU9FHiP3Uw/5xYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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