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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf1d6c071ad4ab2bdf221a4c520787781d61d766aa5110004d790b6192a7fec' 
  AND token = 'C4QUZq+PDRA/x/c+tLJxosBd2HWFZ877w7Ni5myDT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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