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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083660f0b854bba1f2a5efd733f7ad921630b09e3c8aab0dc5bda97c626cb247' 
  AND token = '0TuNqyy6+A5CAyzvsygkU0O7H1zr5DHhSXufGfnBSf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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