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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594d5be158590f39c1a3edf8423cd6412a75c360021e2ac908afbae95ea9f877' 
  AND token = '7rpgOrk23VdOOR9t5gcImWcApNBriZVyd4cAWo3CKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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