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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0feed93e588467a46489434b1a3b85f05bf11a0f925d94ddab40f81d619a183b' 
  AND token = '9Vxsf5o3BTwKgwBxCsFgIO/VQlATTR5GAOSKuFM8ohc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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