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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c78ffd14a5a84af88d4bee47341225e08c9c3f8d3333a20b19de5f13c5fdf3e' 
  AND token = '5F1tW4fitDWFDRvLzAutohDRGQtf1RcG20+CRfKUJ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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