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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3519a1993d7ba35da26102599018cbb192c5d56b78ed773ebb8e6324965f79' 
  AND token = 'UsOngpX2/BhheomEqcCfe0JO5mqBy/9oBvoZSibNBSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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