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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ad93a294bdd435a4d36464e0d016f128dc759925019165ade4d00eb8dc28aa' 
  AND token = 'eOnvGac0a/LjRdptDb30k+f18FqRA9u7kQsTGDPfUag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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