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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efafda61d71d19633fa72d2f2463ad97ca21a00ec763b0c0d0f97f7c2b2fec4d' 
  AND token = 'X1+gBtYKCnChaqja61WO6W4TjeJCFz20dYRDd8V5Or0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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