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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0303a907a508ff475b9e806e31139e8aa86d2b2a23b5d01415156fb43abee251' 
  AND token = 'nuSYEnu5DiP4JHqgdPh7MV8/IRnmUYjn/oMbZY5z2z4=' 
  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"
    }
  }
}