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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b313d56eb7985a2945b501e2e8de342824895294e0ecc8d6a24372a94ba46935' 
  AND token = '9OoxI71WWREFXSiPdKNT0MDU2VBAAzoDq/a3CzRn4es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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