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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3ba50a5fe3bacf920d312c56312aee2f54581561beeddbb8fd7dd827e57efa' 
  AND token = '9eAtGJOlo6P4aR65TrA0wnzGdRiwGkwnhkLmjpj4ri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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