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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0ea6ceafa193a22eb330221377f0a73fca5634328846cac5aa715ba5ec34e9' 
  AND token = 'Wzx2TMjbdctcMt7oSK3xQviVNuI5M97tPB1zEF6VQEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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