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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7d6c538cf242cbbb0c06950955b740eb9e9163c12c61adbe4e2990d2b3adbd' 
  AND token = 'EbwCBf/BDPdbuz5gWQ0mEjuZV+DkxUVeH7ZHj/w1Tzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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