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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a543a6c2512e62af6c7185c061ae18b74a6a6d060abb8647bdd9b7d2b026218' 
  AND token = 'mDTeHpU4t11LJnc+TbJfRQVQi/Fx4q3qoERoIJZdgWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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