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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdf2008b2dcbbe1157d9a50f6c19ad69f3fc14a73f408918ea900e2b0c2208b' 
  AND token = 'Vo93VJRWAt0NUK0EnVly9FxG0xX3O9Lpu754M784AlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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