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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475c8e85f0f6b523c59f73b4dcb7e90a83cd30d0b30635bec61ef0c842ff71bf' 
  AND token = 'jnlfymggLeNuVpptAHvs8Hbu6wCZQGsnkpmXNT4u2j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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