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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fa5a42ea75fe6a15b778a20291584ab63fdd75177e0c18b109955ba64e0dca' 
  AND token = 'gYC7AL+aafQYfkauYO8ZLbroBn5wmJuNqJdaSEdbfhk=' 
  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"
    }
  }
}