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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eebdc58e3cdb237b0a96ccd2663e40996cac9c5e1f61b4541ad270ba5e60209' 
  AND token = 'ICD38gJA4apr2WeqrYJXCYb1AbBdMYT1TW7Hx8zd1K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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