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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377166adad79e7848d9a537fc0be47000fecc60a6bb517874c61e1a044274eed' 
  AND token = 'vcvY2MVvV4s0jR3SGHPQLByR+MdBH3TNz+loU/8xa+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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